The principle behind the world lay out.
As noted elsewhere, the basic Imagine light source does not dim with distance, but does fade depending on the angle of the incident light. Specifically, the light found on a surface is equal to the intensity of the projecting light multiplied by the sine of the incident light. What this means is that any face within 10 degrees of perpendicular will be very close to maximum intensity. The level of illumination will only gradually decrease, and at 60 degrees, there will still be half the light. From there, the brilliance fades rapidly and drops almost as much in the last 5 degrees as in the first 25.
When a principle light sources is broken up into smaller units, their rays will form a broader bright area. Placing more dim lights around 60 degrees away will keep the shading from being too drastic. The addition of other small lights around the scene will simulate back scattered light. Because most of these lights do not cast shadows, their effect will be applied to all surfaces similar to the omnidirectional illumination from the atmosphere.
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